About this detail of the Tiger
The Hachette Tiger Tank model includes the turret floor and the gearbox on it. However, it places this gearbox in the wrong place.
You can see the bare turret floor from a Hachette kit in this blog photo. The gearbox will be glued into the two open slots. As you can see from the photo, Hachette's gearbox is slanted to the rear.
This diagram shows the precise floor layout of a real Tiger. The gearbox is on the transverse axis, facing exactly left and right.
You could improve the acuracy of your Hachette Tiger Tank kit by moving this gearbox to the correct position.